Stockholder's Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders' Equity Note [Abstract]

Schedule of cash dividends declared

We declared the following cash dividend to QSC:

	Years Ended December 31,
	2017		2016	2015
	(Dollars in millions)
Cash dividend declared to QSC	$	1,000	1,300	1,350
Cash dividend paid to QSC	1,000		1,300	1,350